(A) $Planaria$ $(Dugesia)$ belongs to the class $Turbellaria$ of the phylum $Platyhelminthes$. Most free-living flatworms are classified under the cla

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(A) $Planaria$ $(Dugesia)$ belongs to the class $Turbellaria$ of the phylum $Platyhelminthes$. Most free-living flatworms are classified under the class $Turbellaria$,whereas $Taenia$ (tapeworm) and $Fasciola$ (liver fluke) are parasitic. $Pheretima$ belongs to the phylum $Annelida$.